forked from OSchip/llvm-project
429 lines
12 KiB
LLVM
429 lines
12 KiB
LLVM
; RUN: llc < %s -march=x86-64 -mtriple=x86_64-unknown-linux-gnu -asm-verbose=false -post-RA-scheduler=true | FileCheck %s
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declare void @bar(i32)
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declare void @car(i32)
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declare void @dar(i32)
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declare void @ear(i32)
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declare void @far(i32)
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declare i1 @qux()
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@GHJK = global i32 0
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@HABC = global i32 0
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; BranchFolding should tail-merge the stores since they all precede
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; direct branches to the same place.
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; CHECK: tail_merge_me:
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; CHECK-NOT: GHJK
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; CHECK: movl $0, GHJK(%rip)
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; CHECK-NEXT: movl $1, HABC(%rip)
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; CHECK-NOT: GHJK
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define void @tail_merge_me() nounwind {
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entry:
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%a = call i1 @qux()
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br i1 %a, label %A, label %next
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next:
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%b = call i1 @qux()
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br i1 %b, label %B, label %C
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A:
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call void @bar(i32 0)
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store i32 0, i32* @GHJK
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br label %M
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B:
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call void @car(i32 1)
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store i32 0, i32* @GHJK
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br label %M
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C:
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call void @dar(i32 2)
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store i32 0, i32* @GHJK
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br label %M
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M:
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store i32 1, i32* @HABC
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%c = call i1 @qux()
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br i1 %c, label %return, label %altret
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return:
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call void @ear(i32 1000)
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ret void
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altret:
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call void @far(i32 1001)
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ret void
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}
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declare i8* @choose(i8*, i8*)
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; BranchFolding should tail-duplicate the indirect jump to avoid
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; redundant branching.
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; CHECK: tail_duplicate_me:
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; CHECK: movl $0, GHJK(%rip)
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; CHECK-NEXT: jmpq *%r
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; CHECK: movl $0, GHJK(%rip)
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; CHECK-NEXT: jmpq *%r
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; CHECK: movl $0, GHJK(%rip)
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; CHECK-NEXT: jmpq *%r
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define void @tail_duplicate_me() nounwind {
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entry:
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%a = call i1 @qux()
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%c = call i8* @choose(i8* blockaddress(@tail_duplicate_me, %return),
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i8* blockaddress(@tail_duplicate_me, %altret))
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br i1 %a, label %A, label %next
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next:
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%b = call i1 @qux()
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br i1 %b, label %B, label %C
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A:
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call void @bar(i32 0)
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store i32 0, i32* @GHJK
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br label %M
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B:
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call void @car(i32 1)
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store i32 0, i32* @GHJK
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br label %M
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C:
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call void @dar(i32 2)
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store i32 0, i32* @GHJK
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br label %M
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M:
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indirectbr i8* %c, [label %return, label %altret]
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return:
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call void @ear(i32 1000)
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ret void
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altret:
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call void @far(i32 1001)
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ret void
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}
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; BranchFolding shouldn't try to merge the tails of two blocks
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; with only a branch in common, regardless of the fallthrough situation.
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; CHECK: dont_merge_oddly:
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; CHECK-NOT: ret
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; CHECK: ucomiss %xmm1, %xmm2
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; CHECK-NEXT: jbe .LBB2_3
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; CHECK-NEXT: ucomiss %xmm0, %xmm1
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; CHECK-NEXT: ja .LBB2_4
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; CHECK-NEXT: .LBB2_2:
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; CHECK-NEXT: movb $1, %al
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; CHECK-NEXT: ret
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; CHECK-NEXT: .LBB2_3:
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; CHECK-NEXT: ucomiss %xmm0, %xmm2
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; CHECK-NEXT: jbe .LBB2_2
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; CHECK-NEXT: .LBB2_4:
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; CHECK-NEXT: xorb %al, %al
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; CHECK-NEXT: ret
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define i1 @dont_merge_oddly(float* %result) nounwind {
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entry:
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%tmp4 = getelementptr float* %result, i32 2
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%tmp5 = load float* %tmp4, align 4
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%tmp7 = getelementptr float* %result, i32 4
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%tmp8 = load float* %tmp7, align 4
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%tmp10 = getelementptr float* %result, i32 6
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%tmp11 = load float* %tmp10, align 4
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%tmp12 = fcmp olt float %tmp8, %tmp11
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br i1 %tmp12, label %bb, label %bb21
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bb:
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%tmp23469 = fcmp olt float %tmp5, %tmp8
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br i1 %tmp23469, label %bb26, label %bb30
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bb21:
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%tmp23 = fcmp olt float %tmp5, %tmp11
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br i1 %tmp23, label %bb26, label %bb30
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bb26:
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ret i1 0
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bb30:
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ret i1 1
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}
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; Do any-size tail-merging when two candidate blocks will both require
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; an unconditional jump to complete a two-way conditional branch.
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; CHECK: c_expand_expr_stmt:
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; CHECK: jmp .LBB3_11
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; CHECK-NEXT: .LBB3_9:
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; CHECK-NEXT: movq 8(%rax), %rax
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; CHECK-NEXT: xorb %dl, %dl
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; CHECK-NEXT: movb 16(%rax), %al
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; CHECK-NEXT: cmpb $16, %al
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; CHECK-NEXT: je .LBB3_11
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; CHECK-NEXT: cmpb $23, %al
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; CHECK-NEXT: jne .LBB3_14
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; CHECK-NEXT: .LBB3_11:
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%0 = type { %struct.rtx_def* }
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%struct.lang_decl = type opaque
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%struct.rtx_def = type { i16, i8, i8, [1 x %union.rtunion] }
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%struct.tree_decl = type { [24 x i8], i8*, i32, %union.tree_node*, i32, i8, i8, i8, i8, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %union.tree_node*, %struct.rtx_def*, %union..2anon, %0, %union.tree_node*, %struct.lang_decl* }
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%union..2anon = type { i32 }
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%union.rtunion = type { i8* }
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%union.tree_node = type { %struct.tree_decl }
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define fastcc void @c_expand_expr_stmt(%union.tree_node* %expr) nounwind {
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entry:
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%tmp4 = load i8* null, align 8 ; <i8> [#uses=3]
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switch i8 %tmp4, label %bb3 [
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i8 18, label %bb
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]
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bb: ; preds = %entry
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switch i32 undef, label %bb1 [
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i32 0, label %bb2.i
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i32 37, label %bb.i
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]
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bb.i: ; preds = %bb
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switch i32 undef, label %bb1 [
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i32 0, label %lvalue_p.exit
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]
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bb2.i: ; preds = %bb
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br label %bb3
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lvalue_p.exit: ; preds = %bb.i
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%tmp21 = load %union.tree_node** null, align 8 ; <%union.tree_node*> [#uses=3]
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%tmp22 = getelementptr inbounds %union.tree_node* %tmp21, i64 0, i32 0, i32 0, i64 0 ; <i8*> [#uses=1]
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%tmp23 = load i8* %tmp22, align 8 ; <i8> [#uses=1]
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%tmp24 = zext i8 %tmp23 to i32 ; <i32> [#uses=1]
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switch i32 %tmp24, label %lvalue_p.exit4 [
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i32 0, label %bb2.i3
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i32 2, label %bb.i1
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]
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bb.i1: ; preds = %lvalue_p.exit
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%tmp25 = getelementptr inbounds %union.tree_node* %tmp21, i64 0, i32 0, i32 2 ; <i32*> [#uses=1]
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%tmp26 = bitcast i32* %tmp25 to %union.tree_node** ; <%union.tree_node**> [#uses=1]
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%tmp27 = load %union.tree_node** %tmp26, align 8 ; <%union.tree_node*> [#uses=2]
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%tmp28 = getelementptr inbounds %union.tree_node* %tmp27, i64 0, i32 0, i32 0, i64 16 ; <i8*> [#uses=1]
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%tmp29 = load i8* %tmp28, align 8 ; <i8> [#uses=1]
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%tmp30 = zext i8 %tmp29 to i32 ; <i32> [#uses=1]
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switch i32 %tmp30, label %lvalue_p.exit4 [
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i32 0, label %bb2.i.i2
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i32 2, label %bb.i.i
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]
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bb.i.i: ; preds = %bb.i1
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%tmp34 = tail call fastcc i32 @lvalue_p(%union.tree_node* null) nounwind ; <i32> [#uses=1]
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%phitmp = icmp ne i32 %tmp34, 0 ; <i1> [#uses=1]
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br label %lvalue_p.exit4
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bb2.i.i2: ; preds = %bb.i1
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%tmp35 = getelementptr inbounds %union.tree_node* %tmp27, i64 0, i32 0, i32 0, i64 8 ; <i8*> [#uses=1]
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%tmp36 = bitcast i8* %tmp35 to %union.tree_node** ; <%union.tree_node**> [#uses=1]
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%tmp37 = load %union.tree_node** %tmp36, align 8 ; <%union.tree_node*> [#uses=1]
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%tmp38 = getelementptr inbounds %union.tree_node* %tmp37, i64 0, i32 0, i32 0, i64 16 ; <i8*> [#uses=1]
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%tmp39 = load i8* %tmp38, align 8 ; <i8> [#uses=1]
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switch i8 %tmp39, label %bb2 [
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i8 16, label %lvalue_p.exit4
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i8 23, label %lvalue_p.exit4
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]
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bb2.i3: ; preds = %lvalue_p.exit
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%tmp40 = getelementptr inbounds %union.tree_node* %tmp21, i64 0, i32 0, i32 0, i64 8 ; <i8*> [#uses=1]
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%tmp41 = bitcast i8* %tmp40 to %union.tree_node** ; <%union.tree_node**> [#uses=1]
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%tmp42 = load %union.tree_node** %tmp41, align 8 ; <%union.tree_node*> [#uses=1]
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%tmp43 = getelementptr inbounds %union.tree_node* %tmp42, i64 0, i32 0, i32 0, i64 16 ; <i8*> [#uses=1]
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%tmp44 = load i8* %tmp43, align 8 ; <i8> [#uses=1]
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switch i8 %tmp44, label %bb2 [
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i8 16, label %lvalue_p.exit4
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i8 23, label %lvalue_p.exit4
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]
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lvalue_p.exit4: ; preds = %bb2.i3, %bb2.i3, %bb2.i.i2, %bb2.i.i2, %bb.i.i, %bb.i1, %lvalue_p.exit
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%tmp45 = phi i1 [ %phitmp, %bb.i.i ], [ false, %bb2.i.i2 ], [ false, %bb2.i.i2 ], [ false, %bb.i1 ], [ false, %bb2.i3 ], [ false, %bb2.i3 ], [ false, %lvalue_p.exit ] ; <i1> [#uses=1]
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%tmp46 = icmp eq i8 %tmp4, 0 ; <i1> [#uses=1]
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%or.cond = or i1 %tmp45, %tmp46 ; <i1> [#uses=1]
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br i1 %or.cond, label %bb2, label %bb3
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bb1: ; preds = %bb2.i.i, %bb.i, %bb
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%.old = icmp eq i8 %tmp4, 23 ; <i1> [#uses=1]
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br i1 %.old, label %bb2, label %bb3
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bb2: ; preds = %bb1, %lvalue_p.exit4, %bb2.i3, %bb2.i.i2
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br label %bb3
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bb3: ; preds = %bb2, %bb1, %lvalue_p.exit4, %bb2.i, %entry
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%expr_addr.0 = phi %union.tree_node* [ null, %bb2 ], [ %expr, %bb2.i ], [ %expr, %entry ], [ %expr, %bb1 ], [ %expr, %lvalue_p.exit4 ] ; <%union.tree_node*> [#uses=0]
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unreachable
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}
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declare fastcc i32 @lvalue_p(%union.tree_node* nocapture) nounwind readonly
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declare fastcc %union.tree_node* @default_conversion(%union.tree_node*) nounwind
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; If one tail merging candidate falls through into the other,
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; tail merging is likely profitable regardless of how few
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; instructions are involved. This function should have only
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; one ret instruction.
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; CHECK: foo:
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; CHECK: callq func
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; CHECK-NEXT: .LBB4_2:
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; CHECK-NEXT: addq $8, %rsp
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; CHECK-NEXT: ret
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define void @foo(i1* %V) nounwind {
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entry:
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%t0 = icmp eq i1* %V, null
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br i1 %t0, label %return, label %bb
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bb:
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call void @func()
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ret void
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return:
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ret void
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}
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declare void @func()
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; one - One instruction may be tail-duplicated even with optsize.
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; CHECK: one:
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; CHECK: movl $0, XYZ(%rip)
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; CHECK: movl $0, XYZ(%rip)
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@XYZ = external global i32
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define void @one() nounwind optsize {
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entry:
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%0 = icmp eq i32 undef, 0
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br i1 %0, label %bbx, label %bby
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bby:
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switch i32 undef, label %bb7 [
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i32 16, label %return
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]
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bb7:
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volatile store i32 0, i32* @XYZ
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unreachable
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bbx:
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switch i32 undef, label %bb12 [
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i32 128, label %return
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]
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bb12:
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volatile store i32 0, i32* @XYZ
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unreachable
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return:
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ret void
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}
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; two - Same as one, but with two instructions in the common
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; tail instead of one. This is too much to be merged, given
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; the optsize attribute.
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; CHECK: two:
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; CHECK-NOT: XYZ
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; CHECK: movl $0, XYZ(%rip)
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; CHECK: movl $1, XYZ(%rip)
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; CHECK-NOT: XYZ
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; CHECK: ret
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define void @two() nounwind optsize {
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entry:
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%0 = icmp eq i32 undef, 0
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br i1 %0, label %bbx, label %bby
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bby:
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switch i32 undef, label %bb7 [
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i32 16, label %return
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]
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bb7:
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volatile store i32 0, i32* @XYZ
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volatile store i32 1, i32* @XYZ
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unreachable
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bbx:
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switch i32 undef, label %bb12 [
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i32 128, label %return
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]
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bb12:
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volatile store i32 0, i32* @XYZ
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volatile store i32 1, i32* @XYZ
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unreachable
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return:
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ret void
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}
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; two_nosize - Same as two, but without the optsize attribute.
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; Now two instructions are enough to be tail-duplicated.
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; CHECK: two_nosize:
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; CHECK: movl $0, XYZ(%rip)
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; CHECK: movl $1, XYZ(%rip)
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; CHECK: movl $0, XYZ(%rip)
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; CHECK: movl $1, XYZ(%rip)
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define void @two_nosize() nounwind {
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entry:
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%0 = icmp eq i32 undef, 0
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br i1 %0, label %bbx, label %bby
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bby:
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switch i32 undef, label %bb7 [
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i32 16, label %return
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]
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bb7:
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volatile store i32 0, i32* @XYZ
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volatile store i32 1, i32* @XYZ
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unreachable
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bbx:
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switch i32 undef, label %bb12 [
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i32 128, label %return
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]
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bb12:
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volatile store i32 0, i32* @XYZ
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volatile store i32 1, i32* @XYZ
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unreachable
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return:
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ret void
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}
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; Tail-merging should merge the two ret instructions since one side
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; can fall-through into the ret and the other side has to branch anyway.
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; CHECK: TESTE:
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; CHECK: imulq
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; CHECK-NEXT: LBB8_2:
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; CHECK-NEXT: ret
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define i64 @TESTE(i64 %parami, i64 %paraml) nounwind readnone {
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entry:
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%cmp = icmp slt i64 %parami, 1 ; <i1> [#uses=1]
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%varx.0 = select i1 %cmp, i64 1, i64 %parami ; <i64> [#uses=1]
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%cmp410 = icmp slt i64 %paraml, 1 ; <i1> [#uses=1]
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br i1 %cmp410, label %for.end, label %bb.nph
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bb.nph: ; preds = %entry
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%tmp15 = mul i64 %paraml, %parami ; <i64> [#uses=1]
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ret i64 %tmp15
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for.end: ; preds = %entry
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ret i64 %varx.0
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}
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